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comparison, no matter where the emissions are generated, the same environmental
impact parameters should be used for life cycle impact assessment (see Section 10).
6. Cut-off rules
For any impact category, if the sum of various impacts from a specific
process/activity is less than 1% of the impact equivalent in that category, such a
process/activity may be neglected during the inventory analysis. Nonetheless, the
accumulated impact of neglected process/activity may not exceed 5%. Components
and materials omitted from the LCA shall be documented.
(Note: This judgment for this “1% Rule” is based on the environment relevance
assessment of material input to the system, and does not consider special and
exceptional environmental impacts.)
7. Allocation rules
The main allocation rules shall be valid for the entire product system. For other
secondary processes, other allocation rules may be defined; however, the use of these
rules should be justified. Product-specific information should be preferentially
collected in order to avoid the need for allocation. While selecting allocation rules, the
following principles are recommended.
- Multi-output:
The allocations are based on the changes in the resource
consumption and pollutant emissions (for example, adopted quantity allocation for
some main component, or surface allocation for some components), following the
changes in the studied system’s output product or function or economical
relationship.
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Multi-input: The allocation is based on actual relationship. For example, the
manufacturing process’s emissions may be affected by the change in waste flow
input.
Open loop recycling: For the input of recycled materials or energy during the
manufacturing stage of the product system, the transportation between the
recycling process and the recycling to material use shall be included in the dataset.
For the product which shall be recycled during the manufacturing stage, the
transportation towards the recycling process shall be included.
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